login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A250927 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element 9
58, 344, 344, 2007, 4148, 2007, 11693, 50722, 50722, 11693, 68160, 628146, 1320397, 628146, 68160, 397432, 7811640, 34521887, 34521887, 7811640, 397432, 2317569, 97205912, 899626256, 1887760064, 899626256, 97205912, 2317569, 13514765 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

.......58.........344...........2007.............11693................68160

......344........4148..........50722............628146..............7811640

.....2007.......50722........1320397..........34521887............899626256

....11693......628146.......34521887........1887760064.........102912852059

....68160.....7811640......899626256......102912852059.......11784958341212

...397432....97205912....23390844328.....5613563039740.....1352300043218971

..2317569..1209466635...607786907671...306543548743117...155249795843668280

.13514765.15047023115.15792648591051.16748448512897363.17818166218188667617

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..180

FORMULA

Empirical for column k:

k=1: a(n) = 9*a(n-1) -23*a(n-2) +29*a(n-3) -16*a(n-4) +4*a(n-5)

k=2: [order 13]

k=3: [order 31]

k=4: [order 81]

EXAMPLE

Some solutions for n=2 k=4

..0..1..0..1..1....0..2..2..2..1....0..2..0..1..2....1..0..2..0..2

..0..1..0..0..0....0..0..0..0..0....0..2..0..0..2....0..0..1..0..2

..0..2..2..2..0....0..1..1..1..2....0..1..1..0..1....0..0..0..0..1

CROSSREFS

Sequence in context: A051972 A027987 A141779 * A250920 A235673 A235730

Adjacent sequences:  A250924 A250925 A250926 * A250928 A250929 A250930

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Nov 28 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 26 03:19 EDT 2021. Contains 347664 sequences. (Running on oeis4.)